Remember Lot"s wife. She perished because she looked back. "Lest," says S. Ambrose, "as she looked back on the burning Sodom, against the command of the angel, and was changed into a pillar of salt, so you also, against these commandments of mine, may return to the life of the world, and perish with that which is perishing and burning." S. Augustine (Lib ii. Quæst. Evang. quæst43): "What is the meaning of Lot"s wife? She represents those who look back in tribulation and separate themselves from the hope of the Divine Promise, and who are therefore changed into a pillar of salt, that by admonishing men not to do the same, they may, as it were, season their hearts, and not become fools."
As Lot only escaped destruction by leaving all things, and flying immediately to the mountain, whereas his wife, by shewing an affection for the things she had left, and looking back, perished; so those who, in the time of tribulation, forgetting the reward that awaits them in heaven, look back to the pleasures of this world, which the wicked enjoy, are sure to perish. (St. Ambrose)
Ta opiso epilanthanesthai, tois de emprosthen epekteinesthai. (Philippians iii. 13.)
